I agree.. it's an intriguing proposition. I may very well depend on how old some one was when they entered the new culture. Things child pick up in young childhood often continue to influence them throughout adulthood.
Theories and taboos about sex take up much of our time as a culture, and many of these are tought to children before they actually understand what the act of sex is.
It would be very hard for a new person, who had been indocterinated all of his life to feel one way have to change that.
If the love for the girl was that strong, he may do it, but one still couldn't be sure if he was really "into it" or if he felt bad/guilty the entire time.
As was said before, it also depends a lot on the guy.
